/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package servlets.patient.prescription;

import be.ugent.medirem.logic.PatientRemote;
import be.ugent.medirem.logic.TaskRemote;
import be.ugent.medirem.persistence.entity.details.MedicationTaskDetails;
import be.ugent.medirem.persistence.exception.EntityNotFoundException;
import be.ugent.medirem.persistence.util.TaskStatus;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Simon
 */
public class PrescriptionUpdateServlet extends HttpServlet {

    @EJB
    private PatientRemote patientBean;
    @EJB
    private TaskRemote taskBean;

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String username = request.getUserPrincipal().getName();
        Long id = patientBean.getPatientId(username);
        if (id == 0) {
            request.getRequestDispatcher("/patient/prescriptions").forward(request, response);
            return;
        }
        response.setContentType("text/x-json");
        PrintWriter out = response.getWriter();
        try {
            String tasks = "";
            int i = 0;
            for (MedicationTaskDetails task : taskBean.getAllUnseenTasks(id)) {
                if (task.getStatus() == TaskStatus.NOT_SEEN) {
                    try {
                        taskBean.updateTaskStatus(task.getId(), id, TaskStatus.NOT_COMPLETED);
                    } catch (IllegalArgumentException ex) {
                        Logger.getLogger(PrescriptionUpdateServlet.class.getName()).log(Level.SEVERE, null, ex);
                    } catch (EntityNotFoundException ex) {
                        Logger.getLogger(PrescriptionUpdateServlet.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
                tasks += '{' + task.toJson() + "},";
                i++;
            }
            if (i != 0) {
                tasks.substring(tasks.length() - 1, tasks.length());
                tasks += "]";
                tasks = "tasks:[" + tasks;
            }
            out.write("{success:" + ((i != 0) ? "true," + tasks : "false") + "}");
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
